tag:blogger.com,1999:blog-6573490177275309262.post2776862176935236616..comments2019-04-17T09:19:50.666-07:00Comments on Airship Ventures: Pure ThoughtsAlex Hallhttp://www.blogger.com/profile/01092592174255844374noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6573490177275309262.post-72119657552089544782008-10-13T09:31:00.000-07:002008-10-13T09:31:00.000-07:00I assume you must have some small amount of leakag...I assume you must have some small amount of leakage. How often do you have to top up the helium? Just curious.MiGranthttps://www.blogger.com/profile/05495825081836632639noreply@blogger.com